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864989 is a prime number
BaseRepresentation
bin11010011001011011101
31121221112122
43103023131
5210134424
630312325
710231556
oct3231335
91557478
10864989
11540974
123586a5
13243938
1418732d
1512145e
hexd32dd

864989 has 2 divisors, whose sum is σ = 864990. Its totient is φ = 864988.

The previous prime is 864979. The next prime is 865001. The reversal of 864989 is 989468.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 708964 + 156025 = 842^2 + 395^2 .

It is a cyclic number.

It is not a de Polignac number, because 864989 - 28 = 864733 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (864959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432494 + 432495.

It is an arithmetic number, because the mean of its divisors is an integer number (432495).

2864989 is an apocalyptic number.

It is an amenable number.

864989 is a deficient number, since it is larger than the sum of its proper divisors (1).

864989 is an equidigital number, since it uses as much as digits as its factorization.

864989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 44.

The square root of 864989 is about 930.0478482315. The cubic root of 864989 is about 95.2803904560.

The spelling of 864989 in words is "eight hundred sixty-four thousand, nine hundred eighty-nine".